论文标题
麦哲伦边缘调查IV。 SMC郊区复杂的潮汐碎片
The Magellanic Edges Survey IV. Complex tidal debris in the SMC outskirts
论文作者
论文摘要
我们将来自Magellanic Edges调查（MAGES）的数据与Gaia Edr3结合使用，以研究小麦芽云的极端南部郊区（SMC），重点放在长臂状结构的东端的一个田野上，这些结构周围包裹着大型麦哲伦云（LMC）的南部外围。与该结构的其余部分不同，该结构被认为由扰动的LMC磁盘材料组成，场的骨料特性表明与SMC有明确的联系。我们找到了该领域两个恒星种群的证据：一种具有与主SMC郊区郊区一致的特性，另一个具有显着扰动。扰动的人群平均〜0.2 dex富含金属含量，并且位于占优势人群前的〜7 kpc，相对于SMC中心的总空间速度大约为230 km/s，在LMC的方向上差异约为230 km/s。我们推测了这种扰动人群的可能起源，其中最合理的是它包括来自内部SMC的碎屑，这些碎屑最近因与LMC的相互作用而潮湿。
We use data from the Magellanic Edges Survey (MagES) in combination with Gaia EDR3 to study the extreme southern outskirts of the Small Magellanic Cloud (SMC), focussing on a field at the eastern end of a long arm-like structure which wraps around the southern periphery of the Large Magellanic Cloud (LMC). Unlike the remainder of this structure, which is thought to be comprised of perturbed LMC disk material, the aggregate properties of the field indicate a clear connection with the SMC. We find evidence for two stellar populations in the field: one having properties consistent with the outskirts of the main SMC body, and the other significantly perturbed. The perturbed population is on average ~0.2 dex more metal-rich, and is located ~7 kpc in front of the dominant population with a total space velocity relative to the SMC centre of ~230 km/s broadly in the direction of the LMC. We speculate on possible origins for this perturbed population, the most plausible of which is that it comprises debris from the inner SMC that has been recently tidally stripped by interactions with the LMC.
